Go Back   Rotary Car Club > Tech Discussion > RX-7 2nd Gen Specific (1986-92)

RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections.

Reply
 
Thread Tools Display Modes
Old 05-07-2015, 05:41 PM   #1
Pete_89T2
Lifetime Rotorhead
 
Pete_89T2's Avatar
 
Join Date: Apr 2010
Location: Elkton, MD
iTrader: (1)
Posts: 861
Rep Power: 9
Pete_89T2 is on a distinguished road
Default Condensor that grounds/bolts to clutch slave

There is square black condenser (capacitor) with a grounding lug that grounds to the engine on one of the clutch slave cylinder bolts. On mine, the wire broke off right where it goes into the condenser, so it can't be spliced/fixed.

Based on FSM schematics, I'm pretty sure this condenser is part of the oil pressure meter circuit - can anyone confirm?

If so, it's just there to shunt/ high freq. noise off of the oil sender's DC reading. Can probably live without it, but easy enough to fix by wiring in another 10 microfarad or so capacitor as a substitute for the stock part.






Pete_89T2 is offline   Reply With Quote
Old 05-07-2015, 06:51 PM   #2
RETed
RCC Addict
 
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
iTrader: (1)
Posts: 1,795
Rep Power: 12
RETed will become famous soon enough
Default

You are correct.
It is to minimize pulses from the oil pressure sensor to the oil pressure gauge in the instrument cluster.
Many times, it is broken or left disconnected - usually due to a clutch job and / or disconnecting the transmission from the engine.
I've never seen the stock oil pressure gauge "freak out" due to it not working.

Side note, there's another, identical cap located under the trailing coil pack.
That one is to minimize interference from the trailing coil pack switching between the front and the rear rotor for the ignition select.


-Ted
__________________
reted_2000@yahoo.com
Technical Advisor
FC3S Pro
http://fc3spro.com/



Quote:
Originally Posted by TitaniumTT View Post
because you're only as good as your backup
RETed is offline   Reply With Quote
Old 05-07-2015, 08:14 PM   #3
Pete_89T2
Lifetime Rotorhead
 
Pete_89T2's Avatar
 
Join Date: Apr 2010
Location: Elkton, MD
iTrader: (1)
Posts: 861
Rep Power: 9
Pete_89T2 is on a distinguished road
Default

Quote:
Originally Posted by RETed View Post
You are correct.
It is to minimize pulses from the oil pressure sensor to the oil pressure gauge in the instrument cluster.
Many times, it is broken or left disconnected - usually due to a clutch job and / or disconnecting the transmission from the engine.
I've never seen the stock oil pressure gauge "freak out" due to it not working.

Side note, there's another, identical cap located under the trailing coil pack.
That one is to minimize interference from the trailing coil pack switching between the front and the rear rotor for the ignition select.


-Ted
Thanks Ted, that's what I thought. Being an EE, and reading the FSM schematic, I knew that one just served as a high-pass noise filter on the oil pressure circuit, but the FSM schematic doesn't always show physical locations of parts. Yeah, I can live without it there, I'll just leave it disconnected.

For those of you reading that are not electrically savvy, if this condenser breaks (one bolted on the clutch slave) DO NOT take the broken wire, slap a lug on it and reconnect it to ground - doing so would short your oil pressure sender to ground and screw up its reading.
Pete_89T2 is offline   Reply With Quote
Old 05-07-2015, 08:29 PM   #4
chibikougan
⊙⊙
 
chibikougan's Avatar
 
Join Date: Dec 2009
Location: Great Falls
iTrader: (4)
Posts: 1,238
Rep Power: 10
chibikougan will become famous soon enough
Default

I might have one lying around if I can find it I will send it if you want it.
__________________
Quote:
You are not a beautiful and unique snowflake.
You are the same decaying organic matter as everyone else,
and we are all a part of the same compost pile.
chibikougan is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:24 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Hosted by www.GotPlacement.com
Ad Management by RedTyger